Nokia NKC-1X Series, Technical Documentation Manual

Page: 26 / 54

NKC-1X
System Module CCS Technical Documentation
Page 26
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Nokia Corporation Issue 1 02/03
System Connector Lines
Battery Connector Lines
BSI and BTEMP lines are protected by spark gaps and the RC-circuit (4k7 & 10n), in
which the resistors are size 0603.
MBUS and FBUS
The opening in the protective metal deck, underneath the battery, is so small that ESD
does not get into the MBUS and FBUS lines in the production test pattern.
Table 4: System Connector lines
System Connector signals that have EMC protection
Protection type VIN XMIXP XMICN XEARP XEARN HEADINT MICP
ferrite bead (600
/199MHz)
X X X X X
ferrite bead (420
/100MHz)
X
spark gaps X X X X X X
PWB capacitors X X X X X X
RC-circuit X X X X X
capacitor to
ground
X X X X X